#define _CRT_SECURE_NO_WARNINGS 1

#include<stdio.h>

int add(int x, int y)
{
    return x + y;
}

int sub(int x, int y)
{
    return x - y;
}

int mul(int x, int y)
{
    return x * y;
}

int div(int x, int y)
{
    return x / y;
}

int mod(int x, int y)
{
    return x % y;
}


void test()
{
    int x, y;
    char c;
    int ans = 0;
    scanf("%d %c %d", &x, &c, &y);
    if (c == '+')
        ans = add(x, y);
    else if (c == '-')
        ans = sub(x, y);
    else if (c == '*')
        ans = mul(x, y);
    else if (c == '/')
        ans = div(x, y);
    else if (c == '%')
        ans = mod(x, y);
    else {
        printf("ERROR");
        return 0;
    }
    printf("%d", ans);
    return 0;
}

void test1()
{
    float x;
    scanf("%f", &x);
    float y = 0;
    if (x <= 15)
    {
        y = 4 * x / 3;
    }
    else
    {
        y = 2.5 * x - 17.5;
    }
    printf("%.2f", y);
}
int main()
{
    
}